172020

Appears in sequences

• a(n) = Sum_{k=1..n} -mu(k+1) * a(n-k), with a(0)=1.at n=23A073776
• G.f.: A(x) = ( G(x)^5 - G(x^5) - 5*x*((1-x^4)/(1-x))/(1-x^5) )/(25*x^2) where G(x) is the g.f. of A110631.at n=27A111583